Alpen High Performance Products has deployed working protypes of at least six state of the art cutting edge window and glass technologies designed to be used in large-scale retrofit applications. The prototype technology installations reflect a search for tomorrow’s most appropriate and exciting cost-effective window and glass technology upgrade solutions to demonstrate how to transform the nation’s aging building stock into leading examples of cutting edge, high-performance buildings. These technologies include solutions to date never deployed side by side in any commercial building, and include the nation’s leading high performance secondary window insert, photovoltaic insulated glass units, daylight redirecting technology, dynamic glass technologies, thin glass technology, and vacuum insulated glass units. A detailed focus will center on the exciting new world of high-performance secondary window inserts and the role of this product in dramatically increasing the overall window performance of existing commercial buildings. With secondary window inserts, we can drastically improve thermal performance and reduce air infiltration and thermal discomfort at a fraction of the cost of new window replacement. New secondary window product improvements allow for windows to be upgraded to very high-performance levels by supplementing existing windows instead of replacing the entire system.